Large Flare and CME (February 16, 2011)

The clip of the large X2 flare (Feb. 15, 2011) seen by Solar Dynamics Observatory (SDO) in extreme ultraviolet light has
been enlarged and superimposed on SOHO's C2 coronagraph for the same period. This was the largest flare in over four
years. The coronagraph shows the faint edge of a "halo" coronal mass ejection (CME) as it races away from the Sun and was
heading towards Earth. Scientists predict that this CME is likely to catch up with ones from the 13th and 14th, and the
whole mass of particles should reach Earth late Thursday or early Friday (UT). They may put on an excellent show of aurora.

In the coronagraph the Sun is blocked out by an occulting disk so that the fainter features of the corona are visible. By
adding in the SDO video clip, we get the best of both worlds. The video covers about 11 hours.

SOHO began its Weekly Pick some time after
sending a weekly image or video clip to the American Museum of Natural
History (Rose Center) in New York City. There, the SOHO Weekly Pick is
displayed with some annotations on a large plasma display.

If your institution would also like to receive the same Weekly Pick from us
for display (usually in Photoshop or QuickTime format), please send
your inquiry to steele.hill@gsfc.nasa.gov.